java 正则表达式替换首尾字符或符号

java 正则表达式替换首尾字符或符号

private String replaceStr(String str){
        Pattern pattern = Pattern.compile("^,+|,+$");
        Matcher matcher = pattern.matcher(str);
        return matcher.replaceAll("");
    }

String newStr = replaceStr(",222,3344,344,,,,,");
System.out.println(newStr);//-----222,3344,344